If you must use registry workarounds, set them as conservatively as possible. For example, use these methods:. Set UrlAllowList to enable as few sites as possible. Setting MaxAllowedZone to 3 or higher exposes your systems to attack from the Internet. After you have gathered the information about your organization's use of HTML Help, review the following examples to see if they are useful in helping you create a strategy to use as you apply security update within your organization.
Making security as strong as possible outweighs the requirement for applications and scenarios that use HTML Help to work correctly. You have Web applications use HTML Help technology, but the owners of these applications can quickly modify these applications to use other technologies.
For any applications and scenarios that require HTML Help technology, you know or can quickly identify the application servers and file shares on which they are deployed. Also, you can provide sufficient protection for these application servers and file shares. Apply security update Then, use a Group Policy object to enforce restrictions.
By default, if you do not modify one or more of the registry entries after you install security update , the security mitigations in security update will be as restrictive as possible.
However, you can use a Group Policy object to prevent individual users from loosening the restrictions themselves. The following registry file makes the security mitigations in security update as restrictive as possible:. If you know that your organization uses no Web applications that require HTML Help, and the users in your organization do not require access to remote.
You may have heard from users that some internal Web applications are affected by the update. Contact the owners of these Web applications and see if they can reengineer features that require HTML Help technology. Selectively enable Web applications. If you find that some Web applications must be able to use HTML Help functionality, you can selectively re-enable access to the servers that host those applications. Note Users may still not be able to open. For more information about this issue and workarounds, click the following article number to view the article in the Microsoft Knowledge Base:.
This approach could work well if some of the following statements apply to your organization:. You are willing to accept additional risk in order to avoid having security update adversely affect your applications.
You cannot quickly identify all specific applications and scenarios that require HTML Help technology. Also, you cannot quickly modify these applications to use other technologies. If your research determines that the Web applications no longer need HTML Help technology, you can deploy the following registry file to establish the maximum restrictions that are supported by security update If you find that some Web applications have to use HTML Help functionality, you can restrict the systems that are enabled to use the technology.
The table also lists the Microsoft Knowledge Base article that you can see for more information. For more information about how to use security zones in Internet Explorer, click the following article number to view the article in the Microsoft Knowledge Base:. Microsoft provides programming examples for illustration only, without warranty either expressed or implied.
When the help window is closed, HtmlHelp will return focus to the owner unless the owner is the desktop. If hwndCaller is the desktop, then the operating system determines where focus is returned. In addition, if HtmlHelp sends any notification messages from the help window, they are sent to hwndCaller as long as you have enabled notification message tracking in the help window definition.
Depending on the uCommand value, specifies the file path to either a compiled help. Specifies the command to complete. Depending on the specified uCommand and the result, HtmlHelp returns one or both of the following:.
The syntax applies to ANSI character sets. If the defined stack size is too small, then the thread created to run HTML Help will also be created with this stack size, and failure could result. If I wait a while, it finally gives me the install screen to install HtmlHelp Workshop files. The first time I did this, I did not wait and clicked on the OK button for the above message screen.
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